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                              July 20, 2021

       Robert D. Reid
       Chief Executive Officer
       Supernova Partners Acquisition Company, Inc.
       4301 50th Street NW
       Suite 300, PMB 1044
       Washington, D.C. 20016

                                                        Re: Supernova Partners
Acquisition Company, Inc.
                                                            Amendment No. 2 to
Registration Statement on Form S-4
                                                            Response dated July
14, 2021
                                                            File No. 333-255079

       Dear Mr. Reid:

              We have reviewed your supplemental response and have the
following comments. In
       some of our comments, we may ask you to provide us with information so
we may better
       understand your disclosure.

              Please respond to this letter by amending your registration
statement and providing the
       requested information. If you do not believe our comments apply to your
facts and
       circumstances or do not believe an amendment is appropriate, please tell
us why in your
       response.

              After reviewing any amendment to your registration statement and
the information you
       provide in response to these comments, we may have additional comments.
Unless we note
       otherwise, our references to prior comments are to comments in our July
11, 2021 letter.

       Registration Statement on Form S-4

       Certain Relationships and Related Person Transactions , page 278

   1.                                                   Please revise to
disclose the basis on which the person is a related person. See Item
                                                        404(a)(1) of Regulation
S-K.
       General

   2.                                                   We note your response
and proposed changes in response to prior comment 3 regarding
                                                        your long term
projected contribution margins. Please advise us what years' (e.g., 2023,
                                                        2024, etc.) margins are
presented as 5.5% on the left and 6% to 8% on the right of the
                                                        dotted line on page 14
of the investor presentation. Please also clarify for us how
 Robert D. Reid
Supernova Partners Acquisition Company, Inc.
July 20, 2021
Page 2
      "illustrative" margins for future periods are distinct from "forecasted"
margins for future
      periods. Please advise us of the company's reasonable basis for the
projections, including
      material assumptions used to arrive at the forecasted or illustrated
margins. Refer to Item
      10(b)(2) of Regulation S-K for guidance.
        You may contact Isaac Esquivel at 202-551-3395 or Shannon Menjivar at
202-551-
3856 if you have questions regarding comments on the financial statements and
related
matters. Please contact Ruairi Regan at 202-551-32699 or James Lopez at
202-551-3536 with
any other questions.



                                                            Sincerely,
FirstName LastNameRobert D. Reid
                                                    Division of Corporation
Finance
Comapany NameSupernova Partners Acquisition Company, Inc.
                                                    Office of Real Estate &
Construction
July 20, 2021 Page 2
cc:       Jonathan Corsico, Esq.
FirstName LastName